Electric fan



FIG. 1 is a front, top and right side perspective view of an electric fan, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the drawings illustrate the portions of the electric fan, which form no part of the claimed design. 

CLAIM The ornamental design for an electric fan, as shown and described. 